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CATH Superfamily 3.40.47.10

Thiolase/Chalcone synthase

The name of this superfamily has been modified since the most recent official CATH+ release (v4_2_0). At the point of the last release, this superfamily was: waiting to be named.

Functional Families

Overview of the Structural Clusters (SC) and Functional Families within this CATH Superfamily. Clusters with a representative structure are represented by a filled circle.
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FunFam 52473: 3-oxoacyl-[acyl-carrier-protein] synthase 3 protei...

There are 4 EC terms in this cluster

Please note: EC annotations are assigned to the full protein sequence rather than individual protein domains. Since a given protein can contain multiple domains, it is possible that some of the annotations below come from additional domains that occur in the same protein, but have been classified elsewhere in CATH.

Note: The search results have been sorted with the annotations that are found most frequently at the top of the list. The results can be filtered by typing text into the search box at the top of the table.

EC Term Annotations Evidence
Beta-ketoacyl-[acyl-carrier-protein] synthase III. [EC: 2.3.1.180]
Acetyl-CoA + malonyl-[acyl-carrier-protein] = acetoacetyl-[acyl-carrier- protein] + CoA + CO(2).
  • Involved in the dissociated (or type II) fatty-acid biosynthesis system that occurs in plants and bacteria.
  • In contrast to EC 2.3.1.41 and EC 2.3.1.179, this enzyme specifically uses CoA thioesters rather than acyl-ACP as the primer.
  • In addition to the above reaction, the enzyme can also catalyze the reaction of EC 2.3.1.38, but to a much lesser extent.
  • Responsible for initiating both straight- and branched-chain fatty- acid biosynthesis, with the substrate specificity in an organism reflecting the fatty-acid composition found in that organism.
  • For example, Streptococcus pneumoniae, a Gram-positive bacterium, is able to use both straight- and branched-chain (C4--C6) acyl-CoA primers whereas Escherichia coli, a Gram-negative organism, uses primarily short straight-chain acyl CoAs, with a preference for acetyl-CoA.
 1638 A0A011N9U4 A0A011N9U4 A0A011PT07 A0A011PT07 A0A011QT15 A0A011QT15 A0A038GYE7 A0A038GYE7 A0A060P098 A0A060P098
(1628 more...)
Beta-ketoacyl-[acyl-carrier-protein] synthase I. [EC: 2.3.1.41]
Acyl-[acyl-carrier-protein] + malonyl-[acyl-carrier-protein] = 3-oxoacyl- [acyl-carrier-protein] + CO(2) + [acyl-carrier-protein].
  • Responsible for the chain-elongation step of dissociated (type II) fatty-acid biosynthesis, i.e. the addition of two C atoms to the fatty-acid chain.
  • Escherichia coli mutants that lack this enzyme are deficient in unsaturated fatty acids.
  • Can use fatty acyl thioesters of ACP (C(2) to C(16)) as substrates, as well as fatty acyl thioesters of Co-A (C(4) to C(16)).
  • The substrate specificity is very similar to that of EC 2.3.1.179 with the exception that the latter enzyme is far more active with palmitoleoyl-ACP (C(16)-Delta(9)) as substrate, allowing the organism to regulate its fatty-acid composition with changes in temperature.
 110 A0A090PED6 A0A090PED6 A0A090PVK4 A0A090PVK4 A0A090R8Z1 A0A090R8Z1 A0A090TDV0 A0A090TDV0 A0A090VP85 A0A090VP85
(100 more...)
Beta-ketoacyl-[acyl-carrier-protein] synthase II. [EC: 2.3.1.179]
(Z)-hexadec-11-enoyl-[acyl-carrier-protein] + malonyl-[acyl-carrier- protein] = (Z)-3-oxooctadec-13-enoyl-[acyl-carrier-protein] + CO(2) + [acyl-carrier-protein].
  • Involved in the dissociated (or type II) fatty acid biosynthesis system that occurs in plants and bacteria.
  • While the substrate specificity of this enzyme is very similar to that of EC 2.3.1.41, it differs in that palmitoleoyl-ACP is not a good substrate of EC 2.3.1.41 but is an excellent substrate of this enzyme.
  • The fatty-acid composition of Escherichia coli changes as a function of growth temperature, with the proportion of unsaturated fatty acids increasing with lower growth temperature.
  • Controls the temperature-dependent regulation of fatty-acid composition, with mutants lacking this acivity being deficient in the elongation of palmitoleate to cis-vaccenate at low temperatures.
 2 G2DC03 G2DC03
Acetoacetyl-CoA synthase. [EC: 2.3.1.194]
Acetyl-CoA + malonyl-CoA = acetoacetyl-CoA + CoA + CO(2).
  • The enzyme from the soil bacterium Streptomyces sp. CL190 produces acetoacetyl-CoA to be used for mevalonate production via the mevalonate pathway.
  • Unlike the homologous EC 2.3.1.180 this enzyme does not accept malonyl-[acyl-carrier-protein] as a substrate.
 2 A0A1C3P3K2 A0A1C3P3K2